 This is a special feature lesson or add-on to the course to tell you that Prezi now let you choose the screen ratio. Actually most of the screens are wide screen which is a proportion of 16 by 9 which is a proportion. You can convert that into inches fit for a big screen or for a 15 screen laptop the proportion will always be 16 horizontally and 9 vertically. However many projector screens and many projectors and many devices use a different ratio which is the 4 by 3 which is a slightly shortened ratio to the size. You can see how I have a this gray area this gray area here and here and when I convert that to 16 9 you will see how the screen is actually wider. What happens is that Prezi is having a row on the top of the bottom which means that we see the screen a smaller but in the end it's wider. Now if you don't have any constraints if you know that you will use your presentation with devices with screens or a 16 9 ratio then you choose that and if you know that you are going to use 4 by 3 then you use that. But if you're not sure of if it's a presentation that is going to be used by a lot of people in different setups then you want to turn it off. When you turn it off all the screen proportion constraints go away and the presentation will behave and will look you need to be careful will look differently on different screens. Okay that's it for this exciting new feature on Prezi Next.